Warlocks definitely do NOT suck.  i just hit 69 today, and am very happy with the work ive put into it.  Why you would lose to thing 3-4 levels below you is beyond me.  At lvl 61, ive killed lvl 69s trying to gank me.  at lvl 66-67, i killed this spriest and feral druid that kept trying to kill everyone in nagrand, one on one. i will say that locks do have a harder time in the beginning, but they get exponentially better as you level them.  Then again, You cant just get a freebie class thats going to automatically kill everything for you.  Each class takes a certain amount of skill to fulfill.  what i suggest to you is either, 1. dont complain about a class unless you have reasons to back it up other than whining or 2. level your damn lock up and discover the beauty that makes the warlock so good.